Fluid operated motor



July 25, H HUEBER E AL FLUID OPERATED MOTOR Filed April 24, 1930 Zzzvezzians Hen/1: Hwear and 171101211 6. floriozz/ Allorn y Patented July 25, 1933 STATES ATE orr c HENRY HUEBER, OF BUFFALO, AND ERWIN'O. HORTON, OF HAMBURGtNEW' YORK, ASSIGNORS TO TRICO PRODUCTS CORPORATION, OF BUFFALO, NEW YORK FLUID OPERATED Moron Application filed April 24,

This invention relates to a fluid operated motor primarily adapted for use in the transfer of liquid fuel from a source of supply to the consuming engine, although not restricted thereto.

In the past, the power plant of the motor vehicle has included a tank interposed in the fuel line between the supply and the carburetor, to which the liquid fuel was first delivered from the supply for being fed therefrom by gravity to the carburetor.

The present invention aims to provide a fluid pressure operated fuel pump for replacing the previously used tank; to provide a fuel pump "of the diaphragmtype in which the diaphragm is non-resilient and prefer ably of a fabric construction; and to provide a modified arrangement for controlling and imparting to the diaphragm itsoperative movements.

In the drawing: a

Fig. 1 is a fragmentary view depicting the present invention as applied to a motor vehicle.

Fig. 2 is a vertical sectional view through the improved fuel pump in the act of taking in fuel. p h

Fig. 3 is a transverse sectional view about on line 3-3 of Fig. 2. f Fig, 1 is a View similar to Fig 2but with a pump in the act of expelling fuel.

Referring more in detailto the accompanying drawing, the numeral 1 designates the fuel line leading from the supply tanlr (not shown and usually located at therear of themotor vehicle) to the improved fuel pump generally indicated at 2; 3 is the fuel line continued from the pump to the carburetor 4; and 5 is the suction line from the intake manifold 6 to the fuel pump 2 for actuating the same a suction booster pump 7 of any approved form being interposed in this suction line for providing an ample supply of negative pressure for the efficient operationof the pump.

The fuel pump comprises in its preferred embodiment a casing 13 partitioned by a' diaphragm 14 into two compartments, a wet or fuel compartment 15 and 'a dry or air .50 pressure compartment 16, the former com- 1930. Serial No. 446,929.

partment having valved inlet and outlet ports 17 and 18 respectively connected to the fuel pipes 1 and 8. The diaphragm is preferably formed of afabric ply and is so mounted and acted-upon during its operativestr'okes as to avoid reflex or snapping movements back and forth from one side to the other of the plane of its marginal mounting.

p The dry compartment 16 is providedwith a suction port 19' which is connected to the suction line 5, the port opening through a seat 20 with which is enga'geable a valve 21 for interrupting the communication between the compartment and the source of suction. 65 A play connection is provided between the j valve and the diaphragm and may consist oftelescopic sections, one section embodying asleeve 22 carrying the valve 2land the companion section being in the form of a stud 23, the two sections having respective shoulders 24 and 25 for coacting to pull the next succeeding diaphragm stroke.

A stem 27 slides within an enlarged bore 28 above the valve seat 20 to guide-and steady the valve in its movement toward and from its seat, and after the valve has once been seated so as to interrupt the communication with the'source ofsuction, the vacuous condition obtaining within the chamber 16 is equalized and restored to substantially atmospheric conditions by means of a constantly open but restricted port 29, the restriction of this port being such, relative to the suction port, as to permit the ready lowering of the pressure in the chamber 16 when the valve is unseated. Therefore, with the suction in the line 5 having its within .the chamber 16 approaching atmospheric, by reason of the port 29, the dia- I phragm is free to move in the opposite di- The diaphragm being fabric and non-resilient, this liquid expelling movement is imparted to the dlaphragm by a spring 30 mterposed between the diaphragm and a shoulder 31, the spring being shown in the nature of a coil spring encircling the valve and its extensible mounting. The lower end of the spring may seat on a bearing plate32 carried by the diaphragm, the plate being secured thereon by means of the threaded extension 33 of. the stud 23 and a nut 34 applied to the threaded stem 33 at the underside of the diaphragm to serve not only as a means for securing the bearing plate 32 in position but also connecting the stud 23 to the diaphragm.

The operation of the fuel pump is believed to be obvious from the foregoing. With the parts arranged as illustrated in Fig. 2, the source of suction will create a negative or sub-atmospheric pressure in the chamber 16 to exert a lifting force onthe diaphragm and, aided by the atmospheric pressure on the fuelv in the supply tank, fuel will pass through the inlet port 17 into the chamber 15, filling the space in the latter as provided by the upward distention and displacement of the diaphragm. This. inflowing of the fuel will continue until the valve 21 seats which will interrupt the communication between chamber 16 and the source of suction whereupon "the spring 30 will exert downward pressure on the diaphragm causing the inlet port 17 to close and the outlet port 18 to, open for; an outflow of fuel from the chamber 15. This outflow will continue until the charge of fuel has been consumed by the demands of the carburetorand the valve 21 drawn from its seat.- As the diaphragm 14;continues its liquid expelling travel the valve 21 will be held to its seat by reason of the pressure difl'erential at op'osite sides thereof-s0 that the valve support 22, 23 will be distended,

compressing the spring 26. The spring 30 is obviously stronger than the spring 26 and is sufl'icient to overcom the adhesion and pressures holding the valve to its seat when otherwise unresisted. Consequently, when the valve is unseated the compressed spring 26 will contract the valve support 22, 23 to definitely space the valve from its seat, substantially as indicated in Fig. 2, whereby the diaphragm is permitted a definite upward movement for taking in an ample volume of fuel before the valve is again brought to its.

seat;

With the spring30 overcoming the "forces tending to hold the valve 21 seated, the

spring 26 will quickly snap the valve away from its seat and communication between the source of suction and the chamber 16 will be re-establishedfor an upward movement of the diaphragm.

It will be observed that the diaphragm has its unsupported active portion always bellied upwardly and is not weakened by reflex movements back and forth to opposite sides of the marginal securement thereof, since on the up stroke of the diaphragm the negative pressure, maintaining in the chamber 16, urges such portion upwardly while on the down stroke the spring pressure meets the liquid resistance ofthe fuel which is being forced from, the chamber 15.

' What is claimed is: r

1. A. fluid operated motor comprising a casing, a flexible diaphragm associated with the casing to form a chamber, a fluid passage. connecting the chamber with a source of low fluid pressure, valve .means for interrupting said pas'sage,'fa constantly opened pas- ;sage of less area than said first passage for connecting said chamber with the atmos phere, an extensible support for the valve means carried by the diaphragm and embodying resilient means tending to hold the support contracted, and other resilient means of greater strength than the. first resilient means for imparting liquid expelling movement tothe diaphragm when the valve is seated and for moving the valve from its seat following a predetermined liquid ex-.

pelling movement of the diaphragm.

2. A fluid operated motor comprlsing a casingpadiaphragm associated with the cas- "mg to form a chamber, a fluid passage connectmg'the chamber with a source of low phere, an extensible support for the valve means carried by the diaphragm and embodying resilient means tending to hold the support contracted, and other resilient means for imparting liquid expelling movement to the diaphragm when the valve is seated.

3. A fluid operated motor comprising a casing,a diaphragm associated with the easing to form a chamber, a fluid passage connecting the chamber with a source of low fluid pressure, valve means for interrupting said fluid passage, a second passage connecting the interior of said chamber with the atmosphere, a stud carried by the diaphragm, a sleeve supporting the valve and telescoping the stud, resilient means inter posed between parts of the stud and the sleeve for normally urging the sleeve intotelescoped relation with the stud, and a coil spring encircling the sleeve and stud and seating on thediaphragm at one end and movement,

having its opposite end bearing on a fixed part of the casing. 7'

4:. A fluid operated motor comprising a casing, a diaphragm associated with the casing to form a chamber,a fluid passage connecting the chamber with a source of low fluid pressure, valve means for interrupting said fluid passage, means for moving the diaphragm when said fluid passage is closed by said valve means, a second passage connecting the interior of said chamber with the atmosphere, a stud carried by the diaphragm, a sleeve supporting the valve and telescoping the stud, resilient means interposed between parts of the stud and the sleeve for normally urging the sleeve into telescoped relation with the stud, and a guiding stem projecting from the sleeve and slidably received through the seat for guiding the valve 3 and the sleeve during their 5. A fluidoperated motor compri sing a casing, a diaphragm associated with the cas ing to form a chamber, said diaphragm'being movable in one directionby'fluid pressure, resilient'means for moving the diaphragm in the opposite direction, a fluid passage connecting the chamber ,with a source of suctlon, valve means for mterrupt-v ing said fluid passage, a second passage connecting the interior of said chamber With passage '6. motor for a fuel pump comprising a casing, a non-resilient diaphragm therein providing therewith a dry chamber, said chamber being provided with a suction port and also with a constantly opened and restrictedatmospheric port,-the suction port connectible to a source of suction and provided with a valve, seat, a valve for engaging the'seat to close the'port, an extensible support for the valve carried by the dia-' phragm, and resilient means encircling the support and interposed between the diaphragm and a fixed portion of the dry compartment and constitutingthe sole means for impartinga movement to the diaphragm in one directionwhen the valve is seated,

HENRYHUEBER. i,

ERWIN so. HORTON. 

